Sram: Designed to handle whatever you can throw at it. Polished aluminum crankarms and the DUB bottom bracket system mean the Rival crankset will keep spinning, no matter what. Elegant and secure direct-mount X-SYNC chainrings from the company that pioneered the 1x drivetrain for the ultimate in consistent chain control over the long haul.FEATURESDirect mount chainrings in 38t through 46tDUB™ bottom bracket adds durability and simplicityWide chainline crankset to fit the biggest gravel tiresLonger DUB crank spindle accommodates both Road and MTB width frame bottom bracket standards for unmatched cross-compatibility across brandsCompatible with 135, 142 and Boost rear spacing SPECIFICATIONSSpeeds: 12BB Compatibility: All SRAM Road WIDE DUB BBsChainring Size: 40TCrank arm length: 172.5mmChainline: 47.5mmBB Spindle Interface: DUBChainring material: AluminumGuard: No GuardBolt Circle Diameter (BCD): Direct Mount (DM)Crank arm material: AluminumColor (Crank arm): Black